step40=[0 0.002 0.01 0.023 0.041 0.066 0.089 0.135 0.18 0.247 0.319 0.404 0.524 0.644 0.776 0.962 1.148 1.376 1.601 1.89 2.202 2.536 2.932 3.348 3.859 4.125 4.568 5.067 5.509 6.042 6.767 7.412 8.059 8.891 9.454 9.952 10.711 11.064 11.916 12.379 12.529 ];
a=[0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 ];
plot(a,step40);
